CVE-2023-29409

MediumCVSS 5.3/10Last modified Jun 17, 2026

Description

Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures. With fix, the size of RSA keys transmitted during handshakes is restricted to <= 8192 bits. Based on a survey of publicly trusted RSA keys, there are currently only three certificates in circulation with keys larger than this, and all three appear to be test certificates that are not actively deployed. It is possible there are larger keys in use in private PKIs, but we target the web PKI, so causing breakage here in the interests of increasing the default safety of users of crypto/tls seems reasonable.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness enumeration

CWE-400

Affected software

Vendor	Product	Versions
Go standard library	crypto/tls	< 1.19.12; >= 1.20.0-0, < 1.20.7; >= 1.21.0-0, < 1.21.0-rc.4

References

https://go.dev/cl/515257Patch
https://go.dev/issue/61460Issue Tracking, Patch, Vendor Advisory
https://groups.google.com/g/golang-announce/c/X0b6CsSAaYI/m/Efv5DbZ9AwAJMailing List, Vendor Advisory
https://pkg.go.dev/vuln/GO-2023-1987Patch, Vendor Advisory
https://security.gentoo.org/glsa/202311-09
https://security.netapp.com/advisory/ntap-20230831-0010/
https://go.dev/cl/515257Patch
https://go.dev/issue/61460Issue Tracking, Patch, Vendor Advisory
https://groups.google.com/g/golang-announce/c/X0b6CsSAaYI/m/Efv5DbZ9AwAJMailing List, Vendor Advisory
https://pkg.go.dev/vuln/GO-2023-1987Patch, Vendor Advisory
https://security.gentoo.org/glsa/202311-09
https://security.netapp.com/advisory/ntap-20230831-0010/

Timeline

Published: Aug 2, 2023
Last modified: Jun 17, 2026
NVD status: Modified

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